Raspberry Pi WiFi issue (Solarcam)

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The Problem

My Raspberry Pi kept disconnecting from wifi:

Apr  6 02:37:13 raspberrypi kernel: [ 1877.518479] wlan0: deauthenticated from 04:4f:4c:6c:01:f9 (Reason: 3=DEAUTH_LEAVING)
Apr  6 02:37:25 raspberrypi kernel: [ 1889.560586] rtl8192cu: MAC auto ON okay!
Apr  6 02:37:25 raspberrypi kernel: [ 1889.627062] rtl8192cu: Tx queue select: 0x05
Apr  6 04:57:20 raspberrypi kernel: [10284.578042] wlan0: deauthenticated from 04:4f:4c:6c:01:f9 (Reason: 6=CLASS2_FRAME_FROM_NONAUTH_STA)

The Solution

  • deinstalled wicd
apt-get remove wicd-daemon
  • configured /etc/network/interfaces to look like this:
auto lo

iface lo inet loopback
iface eth0 inet dhcp

allow-hotplug wlan0
auto wlan0

iface wlan0 inet dhcp
 wpa-ssid "MY_SSID"
 wpa-psk "MY_PRESHAREDKEY"

Installed this script in root's crontab

# wenn wlan0 down, up it
10,25,40,55 * * * * 	/home/pi/webcam/wifiTickle.sh > /dev/null 2>&1 #> /home/pi/webcam/wifiTickle.log
#!/bin/bash
#set -x

# since the wifi sometimes just fails, check and up it (execute in root's crontab)

GBASENAME="${0}"

# Diese Variablen beziehen sich aufs Interface
IFS="`/sbin/ifconfig wlan0 | grep inet | grep 192.168`"
DOWN=$?
NOW="`date +%s`" 
THEN="`cat ~pi/webcam/.lastup`"
DOWNMAX="3600"
# Diese Variablen beziehen sich auf das OS
UPTIME="`cat /proc/uptime | cut -d. -f1`" # seconds up
UPMIN="1800" # Maschine kann maximal alle n Sekunden rebooten -> somit laufen wir nicht einen Loop

function log
{
  logger "${GBASENAME}: $1"
  echo $1
}

#
# Main
#

#log "IFs: ${IFS}"
if [ "${DOWN}" -eq 1 ]; then
  DOWNFOR="`expr ${NOW} - ${THEN}`"

  #deb
  log "wlan0 has no IP. IFs: ${IFS}"
  #log "f: `ifconfig wlan0`"
  #log "f2: `ifconfig -a`"
  #ifconfig -a > ~/webcam/wifiTickle.log2

  if [ "$DOWNFOR" -gt "${DOWNMAX}" ]; then
     log "Last time up: $THEN Now: $NOW. Down for $DOWNFOR. Up for ${UPTIME}."
     if [ "${UPTIME}" -gt "${UPMIN}" ]; then
        log "Interface is down for $DOWNFOR. Machine is up for ${UPTIME}. Rebooting. Hope the best!"
        /sbin/shutdown -r now
     fi
  else
     # das bringt aber nicht immer was.
     # Ich sehe immer wieder DEAUTH_LEAVING. Mit iwconfig wlan0 power off habe ich das Powersaving schon ausgeschaltet.
     # Sieht mehr nach einem Bug im RealTek-Treiber aus.
     # Oder verschiedene WLAN-Manager ("Network Manager" oder "wicd" kommen sich in die Quere) -> apt-get remove wicd-daemon
     # Danach ganz vanilla nur in /etc/network/interfaces (s. https://raspberrypihq.com/how-to-add-wifi-to-the-raspberry-pi/ ) konfiguriert, das scheint es gewesen zu sein
     log "ifdown..." 
     /sbin/ifdown wlan0
     log "ifup..." 
     /sbin/ifup wlan0
  fi
else
  # Merk Dir mal, wann wir (zuletzt) up sind...
  #log up!
  echo "${NOW}" > ~pi/webcam/.lastup # sec since epoch
fi